Reef

both

Level 5/10

Cobblestones

East Sumbawa, Indonesia

🪸Sharp reef

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Cobblestones is a small channel break near Lakey Peak in East Sumbawa, offering both lefts and rights on a compact reef. The wave provides a fun option when the main breaks are too crowded or too big, with shorter rides and a more relaxed atmosphere. It's one of several satellite breaks in the Hu'u area that extends the surfable options beyond the famous Lakey Peak and Lakey Pipe.

10-Day Forecast

Thu6

Fair

2.2mSW@18s

12km/h

2.2m@18s

12km/h

Fri7

Fair

2.4mSW@16s

13km/h

2.4m@16s

13km/h

Sat8

Fair

2.8mSW@16s

13km/h

2.8m@16s

13km/h

Sun9

Fair

2.5mSW@16s

13km/h

2.5m@16s

13km/h

Mon10

Fair

2.4mSSW@15s

11km/h

2.4m@15s

11km/h

Tue11

Poor

3.0mSSW@17s

15km/h

3.0m@17s

15km/h

Wed12

Fair

2.2mSSW@15s

12km/h

2.2m@15s

12km/h

Thu13

Fair

2.9mSSW@17s

10km/h

2.9m@17s

10km/h

Fri14

Fair

2.4mSSW@16s

12km/h

2.4m@16s

12km/h

Sat15

Firing

1.6mSSW@16s

9km/h

1.6m@16s

9km/h

5+ days out, less certain

View 2-year historical scores →

Today's Conditions

Find Flights

Best session: MorningAM 7 km/h · PM 15 km/h · Tide at 8am (0.6m)

Swell

2.2m

SW(217°)

Score: 7/25

Period

18s

Long period groundswell

Score: 22/25

Wind

12km/h

SE(127°)

Score: 10/25

Weather

27°C

0.0mm24%

First light 5:49amSunrise 6:19amSunset 6:05pmLast light 6:35pm

Windswell0.2m@2sSecondary0.5mConfidence

100%

Location & Conditions

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Swell

Wind

Showing forecast for today

Hourly Forecast, Tide & Strike Windows

Strike window: 5:49–11:43am · through lowStrike window: 4:36–6:35pm · droppingIdeal tide: 0.5–1.5m

6am

9am

12pm

3pm

6pm

6am

9am

12pm

3pm

6pm

6am

9am

12pm

3pm

6pm

6am

9am

12pm

3pm

6pm

6am

9am

12pm

3pm

6pm

6am

9am

12pm

3pm

6pm

6am

9am

12pm

3pm

6pm

6am

9am

12pm

3pm

6pm

6am

9am

12pm

3pm

6pm

6am

9am

12pm

3pm

6pm

°C

23°

27°

30°

29°

25°

23°

27°

29°

30°

25°

23°

26°

29°

25°

22°

26°

29°

28°

25°

23°

26°

29°

27°

25°

24°

26°

28°

27°

25°

24°

26°

28°

26°

25°

26°

29°

26°

25°

27°

29°

26°

25°

26°

29°

26°

4m2.0

sec

18s

16s

15s

17s

15s

17s

16s

swell

windkm/h

7g18

8g25

14g38

17g43

14g40

9g20

10g30

14g39

17g40

8g20

9g28

14g37

17g46

15g43

6g16

9g28

16g42

18g48

15g45

4g14

3g18

12g33

18g47

16g44

13g28

14g36

15g41

17g45

6g21

6g20

14g36

17g46

14g47

6g18

5g21

11g34

15g42

13g41

5g18

8g23

14g37

17g47

12g48

4g14

3g17

10g31

15g40

14g40

tidem

1:48am2.6m

8:21am0.6m

2:08pm2.0m

7:54pm0.8m

2:30am2.5m

9:18am0.7m

3:08pm1.7m

8:30pm1.0m

3:21am2.3m

10:46am0.8m

4:50pm1.5m

9:20pm1.2m

4:54am2.2m

12:54pm0.8m

7:45pm1.5m

6:48am2.3m

2:25pm0.6m

9:00pm1.8m

1:55am1.1m

8:13am2.5m

3:16pm0.3m

9:33pm2.1m

3:03am0.9m

9:13am2.7m

3:54pm0.1m

10:10pm2.4m

3:51am0.6m

9:59am2.9m

4:30pm0.0m

4:31am0.4m

10:40am3.0m

5:01pm0.0m

5:11am0.3m

Ideal tideStrike windowNight

Tide times today

1:48 am

High tide - 2.57m

8:21 am

Low tide - 0.62m

2:08 pm

High tide - 1.97m

7:54 pm

Low tide - 0.76m

Times shown in spot-local time.

Strike Score Breakdown

Fair

Components

Swell Direction23/25

Swell Size7/25

Swell Period22/25

Wind10/25

Raw Score62/100

Adjustments

🌊 Tide+5

💨 Gusty Wind-5

Adjusted Score62/100

Confidence

Multiplier×1.00

Final Score62

🌊 Optimal tide window

Plan Your Strike

Return flights to BMU, departing today with a 5-day trip window.

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Location & Conditions

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Swell

Wind

Showing forecast for today

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Spot Details

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Swell Requirements

Optimal direction: SW (215°)
Direction range: 200° - 230°
Size range: 0.9m - 1.8m
Ideal size: 1.5m
Height multiplier: 1.03×
Ideal period: 14s+

Wind Requirements

Optimal direction: E (90°)
Offshore range: 60° - 120°

Tide Requirements

Optimal tide: mid
Optimal range: 0.5m - 1.5m

Water temp

28°C

Wetsuit

Boardshorts / Rashguard

Difficulty

5/10

Crowd level

4/10

Frequently Asked Questions

What tide is best at Cobblestones?

Cobblestones works best on a mid tide, ideally between 0.5m and 1.5m on the local tide chart. The tide chart above shows today’s strike window.

What wind direction is offshore at Cobblestones?

Offshore wind at Cobblestones blows from the E (90°). Anything in the 60° to 120° range grooms the faces; outside it, expect chop or bumpy conditions.

What swell size and direction work best at Cobblestones?

Cobblestones wants SW swell (200° to 230°) between 0.9m and 1.8m, with a period of 14s or more for quality waves.

When is the best time of year to surf Cobblestones?

The main season at Cobblestones is Apr-Oct. A secondary window runs Nov, Dec, Jan, Feb, Mar. Best Apr-Oct (dry season, SE trades offshore). Swells year-round but wet season brings onshore winds.